/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.util;

import java.util.Iterator;

public class TraversableOnceIterable<T> implements Iterable<T> {
	
	private final Iterator<T> iterator;

	public TraversableOnceIterable(Iterator<T> iterator) {
		if (iterator == null) {
			throw new NullPointerException("The iterator must not be null.");
		}
		this.iterator = iterator;
	}
	
	@Override
	public Iterator<T> iterator() {
		if (iterator != null) {
			return iterator;
		} else {
			throw new TraversableOnceException();
		}
	}
}
